%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-4-12 on page I-186 in "Further configuration possibilities".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{159.0pt}
\setlength\textheight{12\baselineskip}
%StartShownPreambleCommands
\usepackage[threshold=5]{csquotes}
\renewcommand\mkcitation [1]{\footnote{#1}}
\renewcommand\mktextquote[6]{#1#2#4#5#3#6}
%StopShownPreambleCommands

\begin{document}
He started his talk with the quotes
\blockquote[Umberto Eco][.]{Our life is full of empty
                            space}  and
\blockquote[Douglas Adams]{Space is big. You just
  won't believe how vastly, hugely, mind-bogglingly
  big it is. I mean, you may think it's a long way
  down the road to the \textelp{chemist}, but that's
  just peanuts to space \textelp{}}.
Later he finished with \blockquote[Albert Einstein]
{God does not play \textelp{}}.
\end{document}
